Rotary engine.



No. 652,044. Patented lune I9, i900. G. C. HUHDE.

ROTARY ENGiNE. :Applianon mednqt. 2o, 1899A (no Model.) 5 sheets-sheet lnum Immun: E J

'wlulllllllllumml l\ TTOHNE YS Patented lune I9, |900.`

G. c. RoHnE. ROTARY ENGINE.

(Application filed Oct. 90, 1899.)

5 Sheets-Shee't 2 (No Model.)

-nhhmw A Tmp/VHS ma Noms Pneus co, uomini-no4, wAsHwcroM o, c.

Patented :une I9, |000.`

G. C. ROHDE. ROTARY ENGINE.

(Application led Oct. 20, 1899.)

5 Sheets-Sheet 3.

(No Model.)

S. E S S W. H W

A TTOHNEYS No. 652,044. Patented June I9, |900.

G. C. ROHOE.

ROTARY ENGINE..

Application filed oct. no, 1899.

5 Sheets-Sheet 4.

(No Model.)

/N VENTO@ A WOR/VE ys W/TNESSES No. 652,044. Patented June i9, |900.

. G. c. 00H00 ROTARY ENGINE (Application led Oct. 20, 1899.) (un Model.)5 sheets-sheet 5.

W/TNESSES .I y v /VEN ron A TTOHNE YS Norms persas co, pnoovumc,wswmamu. a c.

" UNiTED STATES PATENT OFFICE.

GEORGE C. ROI-IDE, OF GUNNISON, COLORADO.

ROTARY ENGINE.

SPECIFICATION forming' part of Letters Patent No. 652,044, dated June19, 1900.

Application filed OGtObl 20, 18Q9. Serial No. 734,201. (No model-l Toall whom it may concern.:

.Be it known that I, GEORG-E C. Renon, of Gunnison, in the county ofGunnison and State of Colorado, have invented a new and Improved RotaryEngine, of which the following is a full, clear, and exact description.

My invention relates to an improvement in rotary engines, and comprisesthe novel features hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is an end elevation of my device. Fig. 2 is a side elevationwith a portion of .the cover broken away to show the manner .ofconnecting with the valve.

Fig. 3 is an elevation taken at right angles to Fig. 2, showing themechanism for controlling the position of the valve. Fig. 4 is asectional plan through the steam-pipes and the reversing-valve. Fig. 5is a sectional plan through the cylinder and valves. Fig. 6 is an endelevation of the cylinder with one valve-'chest in section. Fig. 7 is asectional elevation on the line 7 7 of Fig. 6. Fig. S is a plan view ofthe ring or annular plate which forms the cylinder-heads. Fig. 9 is asection of the same on the line 9 9 of Fig. 8. Fig. 10 is a sectionthrough the piston-disk on the line 10 10 in Fig. 11. Fig. 11 is asection through the piston disk and heads, taken at right angles to Fig.lO. Fig. 12 is a perspective view of one section ot' the casing formingthe cylinder. Fig. 13 is an elevation and partial section of the valves.Fig. 14c is an elevation and partial section of the cut-off valve. Fig.15 is a section through the valves, taken on the line 15 15 ot Fig. 13.Fig. 16 is a detail showing in sectional plan the manner of operatingthe valve-shifting mechanism. Fig. 17 shows in perspective the manner ofconnecting the valve-rod and valve, and Fig. 18 shows the manner ofconnecting the ends of the pressure-counterbalancing pipes with thecylinder and steam-chest.

, The cylinder of my engine is composed of sections A, which are joinedtogetherin such manner as to form an annular steamspace which iscircular in cross-section. Four of these sections A are used, eachsection formin g one-half of one side ofthe cylinder. These sectionsupon their outer peripheries and on the edge which joins with thesect-ions 'upon the opposite sides of the cylinder are provided withoutwardly-extending triangular flanges a. About these flanges passes abinder-ring B, which is formed in two or more sections hinged togetherby two ears h2, which are provided with a pivot-pin h3 and iit over thetriangular fianges a. The inner periphery of the binder-ring is providedwith a triangular groove adapted to receive the two anges a. Theopposite ends of these two sections of the binder-ring are provided withears b, through which passes a clamping-bolt b. This ring, fittingtightly over the flanges upon the cylinder-sections and being bound downthereon, will hold them together without the direct use of bolts betweenthe cylinder-sections. These cylinder-sections have a thickenedcentrally-projecting portion A', which lies upon the side ot' thepiston-disk D.

The sections A upon opposite sides of the cylinder are separated fromeach otherasufficient distance to accommodate the outer portion of thepiston-disk D. This disk is secured to the shaft O and rotatestherewith, said disk having the piston-heads CZ secured thereto andmoving within the annular steamspace formed in the outer portions A ofthe cylinder-sections. Theinnerfacesof theportions A of thecylinder=sections are provided with triangular grooves adapted toreceive triangular 4packing-rings a', which bear against the outer sidesurface of the piston-disk and prevent leakage of steam past the same.piston-disk is shown in sections taken at right Aangles in Figs. 10 and11, and each circular disk is provided With an elastic packing d',placed in a peripheral groove thereof. At two opposite points upon thisdisk it is provided with recesses or slots adapted to receive the stemsof the piston-heads d. These piston-heads are then secured in place bymeans of pins or set-screws d4, which pass through holes formedpartially in the pistondisk and partially in the stems of the heads,thus binding the heads securely in place. The stemsof the piston-headsare l provided with passages Fand d3, formingsteain-ports, by which thesteam lis admitted to and eX- hausted from the cylinder. These ports areseparated by a central Wall i7 and open at The ICO

the inner end of the disk at opposite sides of the piston-disk. Theports d2 are separated from the chamber D2 at the center of the disk byplates or partitions D6. The object of this chamber is to counterbalancethe pressure of steam upon the outer surfaces of the valves. Thesteam-ports cl2 discharge at the side of the piston-disk into thesteam-chests formed upon each side of the cylinder. These steamchestsare formed by the annular rings or sleeves F', which are secured at oneend to the sides of the cylinder and have their outer ends closed bymeans of like plates F. These two parts F F at each side of the disk Dare secured together by means of a two part binder-ring B2, said partsbeing hinged together, as at b4 in Fig. 2, and at opposite ends areclamped by a bolt, the saine as h in the same figure. A triangulargroove is formed upon the inner periphery of the binderring, whichengages triangular flanges formed upon the outer edges of the plate Fand the sleeve F', similar to the manner described -for securing thesections of the cylinder together. The plate F has anoutwardly-projecting flange F2, which, in connection with the collar FS,forms a packing device by which a tight joint may be obtained about theengine-shaft C. Within each of these steam-chests is a combined cut-offvalve, which is shown in detail in Figs. 13, 14, and l5. This valveconsists of two parts, one part consisting of a plate G, which isprovided with two opposite segmental holes G. This plate is alsoprovided with a llange G2, which projects inwardly or toward the centerof the cylinder a short distance from the outer periphery of the plate.Within the recess formed by said fiange lies the cut-off plate H, whichis shown in detail in Fig. 14. This plate has a sleeve Il attached bythread and key, which passes through the central opening in the plate G.The valve portion of this plate consists of the two segmental wings H,which are of such size as to cover the segmental holes G' Vwhen placedin proper position. The other end of the sleeve has teeth h projectingfrom its periphery and forming opposite toothed segments, each of whicheX- tends over about one-third of its circumference. The teet-h of thesesegments are arranged in plural rows and staggered or with the teeth ofone row opposite the spaces of the next row, or otherwise, so that theteeth t', which are formed upon the ends of the valve stems or rods I'and l2, may both turn and slide the valve upon the shaft C as theresult, respectively, of a reciprocating and a turning movement given tosaid rods by means of suitable mechanisms, which will be hereinafterdescribed.

The turning movement of the valve serves to alternately admit and cutoff steam from the cylinder, while the sliding movement permits ittorise from its seat when the steam is escaping or to be held from itsseat permanently, if desired. The valve which is at the time acting asthe exhaust-valve should be held off of its seat, so that theexhaustports may be open all the time, while the valve which is actingas theadmission-valve would not be held off of its seat unless it isdesired to admit steam for the full stroke or so that no expansion issecured. To steady the ends of the rods I and I2, brackets i3 areprovided within the steam-chest and engaging the ends of the rods.Stuing-boxes 2 surround said rods where theyen ter the steamchests.

Upon the shaft O and at alittle distance outside of the valves justdescribed are secured two collars or rings h. These rings are so placedthat the valves may be forced outward or away from the center of thecylinder a slight distance before they come in contact with the ring, asis clearly shown in Fig. 5, in which one of the valves is shown incontact with the side face of the piston-disk and the other is shown asbeing moved away from the piston-disk, so as to contact with one of therings h.

The cylinder-heads are in form of an annular plate or ring E, which isshown separated from the other mechanisms in Figs. 8 and 9. Thisconsists of a thin annular plate which has a liange E' upon its innerperiphery extending to each side of the plate and forming aslightly-greater surface for engaging with the outer periphery of thepistondisk. This plate is also provided with two slots e, which are madeat an angle of about thirty degrees with the plate and are adapted toaccommodate the piston-heads d. The edges of these slots are beveledfrom each side toward the center, making a V-shaped edge. This plate isplaced so as to cut through the steam-space of the cylinder and lies atan angle of about thirty degrees with the plane of rotation of thepiston-disk, as shown ir Figs. 1 and 7. The cylinder is suitably slottedto receive this plate and allow of its passage. The inner periphery ofthe liange E' upon this plate and the outer periphery of the piston-diskare toothed, the teeth intermeshing, so that the revolution of thepiston-disk will cause the plate E to turn about said disk. The teeth d5upon the periphery of the piston-disk extend squarely across the same,while the teeth upon the inner periphery of the liange E extend at anangle of about thirty degrees with the side faces thereof, whereby theteeth upon the disk and plate will intermesh. The teeth upon the plateare in double sets, which cross each other, one set coacting with theteeth upon one side of the piston-disk and the other set with the teethupon the other side of the disk.

The plate E is constrained to move in its proper plane by means of acasing which is formed of the two plates E2 and E3 and which closely tand inclose the plate. The plate F.2 is secured to the outer surfaces ofthe cylinder by means of flanges E4, which are bolted to said cylinder.The plate E2 has a triangu- IOO IIO

l 'lar trough c2 extending about its inner periphery and adapted toreceive the inner portion of the plate E2. The two plates E2 and E3 aresecured to each other by means of a grooved binder-ring B', whichengages with the triangular outer edges c2 of the plates E2 and E2. Itwill thus be seen that, although the plate E passes through slots in thesides of the cylinder, it is inclosed in such manner that the escape ofsteam through these slots is prevented. The slots c in the plate E andthe teeth upon said plate and pistondisk are `so proportioned andlocated that the plate E will be rotated synchronously with thepiston-disk at double the speed, so that the slot e will be presented atthe proper time to receive and pass the piston-heads d.

The engine is suitably supported by means of flanges or lugs A2, whichproject laterally from the sides of the cylinder and engage thestandards X' and X2. The outer ends of the shaft C are supported uponstandards X. The shaft C is provided at one end with a pulley orily-wheel C', by means of which power is communicated from the engine toany desired machinery.

Upon a suitable stand located at one side of the cylinder is mounted themechanism by which the valves G and H are controlled. The two rods I'and l2, which are directly connected with the valve H, pass throughguides 14, by which they are constrained to move in a straight line. Theouter ends of theserods are provided with plural rows of teeth i',similar to the teeth i upon the opposite ends, which engage with thetoothed segments of the valves. The ends of these rods are eachrespectively guided in holes formed in a plate l2, which is secured tothe frame. Loosely keyed upon a shaft K is a disk K', which has toothedsegments 7a, similar in construction to the toothed segments upon thevalves, and said teeth mesh with the teeth By sliding the disk K' therods l' and l2 may be turned and the valves moved away from their seats.

The valve-controlling mechanism is in duplicate, each set controllingthe valves upon one side of the engine. A curved plate R is placed backof each disk K' and has anges R' extending from each edge and embracingthe disk, so that if the plate is moved side- Wise the disk is movedwith it. The two plates R are connected by a bar R2, so that they willbe moved together. The bar R2 is guided in suitable holes in the partsS, S', S2, S3, and S4 of the frame which supports the valve-controllingmechanism.

A lever Q is pivoted at Q2 upon the frame and is provided with the usualhan d-controlled detent, which engages the segment bar or rack Q'. At apoint where it will embrace the bar R2 this lever Q is provided with aboxlike section T, which surrounds the bar R2 and has a pin T' passingdiagonally across the box portion of the lever and through the bar R2.As a result of this construction when the lever is swung upon its pivotit will move the bar R2 lengthwise in its guides, carrying with it theplates R and the toothed disks K', which, through the mechanismpreviously described, shifts the position of the valves, throwing thevalve upon one side close against its seat and moving the one upon theother side away from its seat. In this way the valves are adjusted for areversal in motion of the engine.

The turning of the valves is accomplished by means of a lever J, whichis secured to one section of the bisected shaft K, upon which the disksK' are slidably held. The two-part shaft K extends across the frame, andupon each portion is secured one of the toothed disks K'. On each partof the biseoted shaft K, at their inner ends, the bevelgears M and M'are secured. These gears mesh with bevel-gears M2 and M2, which areloosely mounted upon the shaft O. The shaft O has the reversing-valve O'secured to its lower end, as shown in Fig. 4t, by which the course ofthe steam-supply is controlled. The pipe P is the one connecting withthe boiler and through which steam is supplied to the engine. The pipesP' and P2 connect with opposite sides of the engine, and the pipe P3 isthe exhaust-pipe. The ports in the valve O' are so placed that by aslight turning of the valve the pipes P' and P2 may be used at optioneither as supply or exhaust pipes. This valve is controlled in positionby means of a lever J', which is pivoted to the upper part of the frameand is provided with the usual hand-operated locking device ordetent,which engages the toothed segment bar or rack J 2, a like deviceon the lever J engaging the toothed bar J 2. A bevel-gear N is securedto the lever-pivot and is turned thereby to operate the bevel-gear N',which is secured to the upper end of the shaft O, which carries thevalve O'.

The space between the plates E2 and E3, in which the plate E turns, isconnected with the cylinder by means of the pressure-counterbalancingpipes L L, which connect the steam-chambers and eXhaust-chambersin thecylinder A in the case of each pipe with shallow chambers in the casingE2 E2 on opposite sides of the casing from where the other end connectswith the cylinder, as shown in Fig. l. These shallow chambers in thecasing E2E3 are as near the cylinder A on either side as may he, andeach chamber has an area equal to one-half that of the cylinder. Tocounterbalance the pressure upon the plate within the cylinder, thepipes L are used, which admit steam to the said casing. These pipes aresecured in place by means of a nipple or sleeve L', which is mounted toturn upon a plug L2, which screws into the plate of the casing or thecylinder, the sleeve being threaded to screw upon the threaded end ofthe pipe L, as shown in detail in Fig. 18.

When the lever J' stands perpendicular, all steam is shut off by thevalve 0'. By throwing the lever forward steam 4passes into the IOO ITO

pipe P2, whence it passes into the right-hand steam-chest. Vhen thelever J is standing perpendicular, t-he segmental opening G will be halfclosed by the segmental wings of the` valve H. If the lever J be pushedforward, the opening maybe closed entirely; if drawn backward, it willbe opened full. NVhen opened full,7 steam will pass into the side portsin the piston-disk during a halfstroke, or from the time the piston-headd leaves the point of intersection with the cylinder-head E on eitherside of the cylinder A until it is directly above or below the shaftingC, thus making the cut-off at half the stroke. As the lever is pushedforward the cut-off is brought nearer the beginning of the stroke untilthe steam-port in the valve is entirely closed. The valve G is xed inopposite steam-chests in a reverse positionthat is, in one the segmentalopenings are as shown in Fig. 13, and in the other the upper opening isto the right of the center and the lower one to the left, and the valveH in opening and closing rotates in an opposite direction to the one onthe other side. This combination-Valve being open more or less, if theside ports on the piston-disks are in front of the lports wherever theymay be.

valve-openings G' the steam will pass into these ports cl2 d3 and thenceinto the cylinder A behind the piston-heads d d, and between thesepiston-heads and the cylinder-head plate E thepiston-heads will beforced forward until they reach and pass through the notch e in thecylinder-head plate E in front of them. When the piston-head CZ reachesthe position shown in Fig. 7, half-way through the cylinder-head, thesteam from the upper section of the cylinder A exhausts back through thesteam-port opening in front of the piston-head CZ. The lower` chamberexhausts at the same instant back through the front port of the pistonon the other side, which is exactly opposite d. Vhen the piston hasmoved ahead its own thickness, the port on the back of the piston passesthe cylinder-head E, and the side ports in the piston-disk D beingexactly opposite the piston-heads d steam is admitted and the pistonsare forced on again ad infinitum. Now, to go back, if the sidesteam-ports d2 d3 in `the piston-disk D do not chance to be in front ofthe segmental openings in the valves G H steam will still pass throughinto ,the cylinder if the valve G H be not up tight against the face ofthe piston-disk, because the opening between the valve and the side faceof the piston-disk will connect the two If, however, this valve on theside where the steam seeks to enter is in close contact with the face ofthe piston-disk D, then it must be slightly opened by use of the leverQ. A forward motion will press the valve up to the side face of thepiston-disk and a backward movement will withdraw it. If the valve G Hbe kept slightly withdrawn from the face of the piston-disk on the sidewhich the steam is entering by use of the lever Q, it will serve to feedsteam to the engine during the entire stroke if the valves G H be opento any ex- Vin close contact with the side face of the piston-disk D,except when it may be necessary to open them to start the engine or whenthe engine may be used to the extreme limit of its power. It will beobserved that the two-part Valve G H on the opposite or exhaust side ofthe cylinder A must always be kept removed to a greater or less extentfrom the side face of the piston-disk D in order that the exhaust may beopen all the time. This exhaustvalve should always bekept removed agreater distance from the side face of the piston-disk than theinlet-valve on the opposite side, though to do otherwise would onlywaste power. The engine would still run. The opposite valve G H isoperated to slide it toward and from the piston-disk simultaneously bythe lever Q, so that when one is closed the other is Wide open. In theirturning action they open and close together. When one is closed, theother is al-so. Their simultaneous sliding action is brought about bythelever Q through the guide-shields R'. In this combination-valve theouter half is prevented from rotating by two grooves g in its oppositeedges, which engage the lugs g', which project from the inner surface ofthe steamchests F. These lugs need not extend 4a great distance from theside face of the piston-disk D.

It will be observed that the turning motion of the valves G H is causedby the lever J, which being thrown backward or forward forces the rods Il2 into and out of the steamchests, the toothed ends of the rodsintermeshing with the toothed segments of the valve H, causing the sameto turn. The lever Q induces thelongitudinal action of the valve G H bymeans of arolling motion given thereby to the rods I l2, which aredoublymeshed at right angles with the teeth h and at the other ends withthe teeth 7c, which last are given side motion by means of theguideshield R' and the mechanism of the lever Q, acting upon the bar R2,which is attached to the guide-shield R.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. A rotary engine having ports in the piston-diskopening at the side thereof, a steamchest inclosing said ports, a valvecontrolling the port-opening and comprising two parts, one consisting ofa disk having segmental openings therein, and means for holding itagainst turning, and the other consisting of a member havingsegment-arms adapted to close the openings in said disk and to turn tovary the opening, and means for turning said latter member,substantially as described.

2. A rotary engine having ports in the pis- IIO ton-disk opening at theside thereof, a steamchest inclosing said ports, a valve controlling theport-opening and comprising two parts, one consisting of a disk havingsegmental openings or ports therein, and means for holding it againstturning, and the other consisting of a member having segment-armsadapted to close the openings or ports in said disk and to t-urn to varythe port-opening, a sleeve secured to said adjustable or turning memberof the valve and having teeth upon its periphery arranged in linessubstantially at right angles, a rod entering the steam-chest and havingteeth thereon extending in rows lengthwise and circumferentially thereofand engaging the teeth carried by the adjustable valve member, wherebythe valve may be moved bodily toward or away from its ports and turnedabout its axis, substantially as described.

3. A valve mechanism for rotary engines, comprising a disk surroundingthe engineshaft and having segmental holes or ports therein, means forpreventing said disk or plate from turning about the shaft butpermitting it to slide lengthwise thereof, a cutoff member mounted toslide upon said disk and having segmental arms or plates adapted toclose the ports in said disk, asleeve secured to said out-off member andhaving teeth upon its peripheryv arranged in circumferential and axiallines, and a rod entering the steam-chest and having its end toothed incircumferential and longitudinal lines and engaging the teeth upon thecut-off member, whereby the latter may be slid back and forth upon theshaft, substantially as described.

4. A valve mechanism, comprising a valve member mounted to turn andslide upon its axis, a sleeve thereon having teeth upon its peripheryarranged in circumferential and axial lines,avalveoperating diskhavingsimilar teeth, and a rod having teeth upon its ends adapted toengage both disk and sleeve7 and means for both turning and sliding saiddisk, substantially as described.

5. A valve mechanism, comprising a valve member mounted to turn andslide upon its axis, a sleeve thereon having teeth upon its peripheryarranged in circumferential and axial lines, a valve-operating diskhaving similar teeth and having a sliding keyed connection with itsshaft, a rod having teeth upon its ends adapted to engage both disk andsleeve, a lever secured to the axis of said disk to turn it, a slideengaging the disk to slide it upon its shaft, and a lever for operatingthe slide, substantially as described.

G. The combination in a rotary engine, of a rotary piston-disk and head,and an annular cylinder or casing with cylinder heads or abutmentsconsisting of an annular plate or ring placed at an acute angle with theplane of the pistons revolution and cutting the path of said piston andcylinder on opposite sides, the cylinder having slots accommodating saidring, means for synchronously turning the ring and pistons, and slots inthe ring adapted to pass the pistons through them, substantially asdescribed.

7. The combination in a rotary engine of a rotary piston-disk and heads,and an annular cylinder or casing with cylinder heads or abutmentsconsisting of an annular plate or ring placed at an acute angle with theplane of the pistons revolution and cutting the path of said piston andthe cylinder on opposite sides, the cylinder having slots accommodatingsaid ring, the ring having upon its inner periphery and the piston-diskupon its outer periphery, intermeshing teeth whereby the two are turnedsynchronously, and slots in the ring adapted to pass the pistons throughthem, substantially as described.

8. The combination in a rotary engine, 0f a rotary piston-disk andheads, and an annular cylinder or casing with cylinder heads orabutments consisting of an annular plate or ring placed at an acuteangle with the plane of the pistons revolution and cutting the path ofsaid piston and the cylinder on opposite sides, the cylinder havingslots accommodating said ring, toothed connection between ring andpiston disk whereby the two are turned synchronously, and slots in thering adapted to pass the pistons through them, substantially asdescribed.

9. A rotary-engine cylinder composed of sections divided on a radialplane, said sections having projecting triangular or bevel flanges attheir contact edges, and a bindingring having au internal groove fittingover said flanges and holding the sections together, substantially asdescribed.

l0. A rot-ary engine, having a piston-disk mounted to turn and havingslots or piston receiving sockets in its edge, and pistonheads havingstems secured in said slots or sockets,said stems being provided withsteamports, substantially as described.

ll. A rotary engine having a piston-disk mounted to turn, and havingslots or pistonreceiving sockets in its edge, and piston-heads providedwith stems secured in said slots or sockets and having passages onopposite sides forming steam ports, substantially as described.

12. A rotary engine, having a cylinder provided with an annularsteam-chamber, a rotating piston-disk and heads thereon fitting saidsteam-chamber, in combination with cylinder heads or abutmentsconsisting of an annular plate or ring lying at an acute angle with thecylinder and cutting through the steam-chamber, the walls of saidsteam-chamber having slots accommodating said ring and the ring havingslots permitting the passage of the piston-heads therethrough, a casingfitting closely about the projecting parts of said ring and secured tothe cylinder, and means for turning the ring in unison with thepiston-disk, substantially as described.

13. A rotary engine having a cylinder provided with an annularsteamchamber, a ro=` IOO tatiug piston-disk and heads thereon ttiug saidsteam-chamber, in combination with cylinder heads or abutmentsconsisting of an annular plate or ring lying at an acute angle with thecylinder and cutting through the steam-chamber, the Walls of saidsteam-chamber having slots accommodating said ring, and the ring havingslots permitting the passage of the piston-heads therethrough, a casingfitting closely about the projecting parts of said ring and secured tothe cylinder, and intermeshing teeth upon piston-disk and ring wherebythe two are turned synchronously, substantially as described. y

14. A rotaryT engine, having a cylinder provided With an annularsteam-chamber, a rotating piston-disk and heads thereon fitting saidsteam-chamber, in combination with cylinder heads or abutmentsconsisting of an annular plate or ring lying at an acute angle With thecylinder and cutting through the steam-chamber, the Walls of saidsteam-chamber having slots accommodating said ring and the ring havingslots permitting the passage of the piston-heads therethrough, a casingfitting closely about the projecting parts of said ring and secured tothe cylinder, means for turning the ring in unison With the pistou disk,and pressure counterbalancing pipes connecting the sides of saidring-casing with the cylinder upon the opposite sides of the ring,substantially as specified.

GEORGE C. ROHDE. Witnesses:

C. T. RAWALs, JOHN J. POTTER.

